EP4333090A1 - Electrode and manufacturing method therefor - Google Patents

Electrode and manufacturing method therefor Download PDF

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Publication number
EP4333090A1
EP4333090A1 EP22838018.4A EP22838018A EP4333090A1 EP 4333090 A1 EP4333090 A1 EP 4333090A1 EP 22838018 A EP22838018 A EP 22838018A EP 4333090 A1 EP4333090 A1 EP 4333090A1
Authority
EP
European Patent Office
Prior art keywords
active material
material layer
masking tape
electrode
cutting groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22838018.4A
Other languages
German (de)
English (en)
French (fr)
Inventor
Seo Jun Lee
Hyojin Lee
Tae Su Kim
Hyuk Soo Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Energy Solution Ltd
Original Assignee
LG Energy Solution Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Energy Solution Ltd filed Critical LG Energy Solution Ltd
Publication of EP4333090A1 publication Critical patent/EP4333090A1/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
    • B05D1/322—Removable films used as masks
    • B05D1/325—Masking layer made of peelable film
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to an electrode and a method for preparing the same, and specifically, to an electrode in which a corner portion where an upper surface of an active material layer and a side wall surface forming a thickness of the active material layer meet is formed in a right-angled shape, and a method for preparing the electrode.
  • lithium secondary batteries having high energy density and voltage have been commercialized and widely used.
  • a lithium secondary battery has a structure in which an electrolyte including a lithium salt is impregnated into an electrode assembly having a porous separator provided between a positive electrode and a negative electrode, each of which has an active material coated on a current collector.
  • the method of preparing an electrode includes mixing/dispersing an active material, a binder and a conductor into a solvent to prepare an active material slurry; coating the active material slurry on a thin-film-type current collector and drying thereof to form an active material layer on a current collector; and finally pressing step to increase capacity density of the electrodes and to increase adhesion between the current collector and the active material.
  • mismatching mislocates the position of active material layer when facing the positive electrode/negative electrode, and such a mislocated portion reduces efficiency of charge and discharge.
  • the mismatching portion may cause lithium precipitated on the negative electrode surface, and when such lithium precipitation occurs for a long period of time, a decrease in the battery capacity occurs.
  • the present disclosure has been devised to resolve such problems of the prior art, and in one aspect, is directed to providing a method for preparing an electrode capable of uniformly forming an end portion of an active material layer, and preventing formation of a sliding portion and/or a mismatching portion.
  • the present disclosure is also directed to providing a method for preparing an electrode capable of forming a corner portion where an upper surface of the active material layer and a side wall surface forming a thickness of the active material layer meet in a right-angled shape.
  • an aspect of the present disclosure is also directed to providing an electrode capable of increasing battery capacity by forming a corner portion where an upper surface of the active material layer and a side wall surface forming a thickness of the active material layer meet in a right-angled shape.
  • the present disclosure provides a method for preparing an electrode, including:
  • the present disclosure provides
  • a method for preparing an electrode in according to an aspect of the present invention is effective in uniformly forming an end portion of an active material layer, and preventing formation of a sliding portion and/or a mismatching portion.
  • the present disclosure provides a method capable of forming a corner portion where an upper surface of the active material layer and a side wall surface forming a thickness of the active material layer meet in a right-angled shape.
  • the electrode of the present invention is effective in increasing battery capacity by forming a corner portion where an upper surface of the active material layer and a side wall surface forming a thickness of the active material layer meet in a right-angled shape.
  • the active material layer-nonlaminated portion is also referred to as a "non-coating portion", and means a portion where an electrode tap is formed.
  • active material slurry forming the active material layer includes active material particles, conductor particles, a binder and the like, and by these being bound by the binder at the time when removing the masking tape to form aggregates (clumps) of various sizes, it is difficult to form a uniform cross-section of the active material layer when the active material layer on the upper surface of the masking tape is physically cut by removing the masking tape.
  • the masking tape 20 As the masking tape 20, those known in the art may be used. As the masking tape, a pressure-sensitive adhesive tape may be preferably used, and the pressure-sensitive adhesive tape may include a film substrate 24 and a pressure-sensitive adhesive layer 22 formed on one surface of the film substrate. In this case, binding strength of the pressure-sensitive adhesive layer 22 for a current collector 10 needs to be weaker than binding strength of the pressure-sensitive adhesive layer 22 for the film substrate 24, and such a difference in the binding strength is preferred because the pressure-sensitive adhesive tape is removed without remaining on the current collector.
  • the cutting groove in the step (c) may be formed using a means known in the art such as a knife, and particularly, is preferably formed using a laser. This is due to the fact that, when using a knife or the like, uniformly forming a groove surface of the cutting groove is difficult, working becomes inconvenient due to active material fragments removed during the groove forming process, and quality of the active material layer may be damaged.
  • the shape of the cutting groove is not particularly limited, and may be an alphabet U-like shape, V-like shape or the like.
  • the alphabet U-like shaped cutting groove may have a shape in which the bottom surface and the wall surface are formed to be perpendicular to each other.
  • the cutting groove may be formed to have a width of 10 to 200 ⁇ m and a depth of 10 to 200 ⁇ m, however, the cutting groove size needs to be formed differently depending on the active material layer thickness and the masking tape thickness, and is not limited to the above range.
  • the laser device may be formed including, as illustrated in FIG. 5 , a laser source generator, a delivery mirror, a laser beam width controller, a scanner unit and the like, and the scanner may include a Galvano mirror, a theta lens and the like.
  • the laser source generator may be, for example, an IR fiber laser source generator, and the laser wavelength may be 1000 to 1100 nm and preferably 1060 to 1080 nm, but is not limited thereto.
  • the cutting groove may be formed using a laser after supplying moisture to the cutting groove forming site.
  • Forming the cutting groove using a laser without supplying moisture is not preferred since a problem of active material deterioration caused by heat of the laser (generating heat affected zone) occurs.
  • moisture is supplied in advance before forming the cutting groove by a laser, and then a laser is applied.
  • a method of supplying moisture is not particularly limited, and, for example, moisture may be supplied by spraying water to the active material layer using a spray device or the like.
  • the moisture is, for example, preferably supplied 5 to 30 seconds prior to applying a laser. This is due to the fact that sufficient time is required for moisture to be supplied into the active material layer before applying a laser. However, the time is not limited to the above-mentioned range since the degree of moisture absorption varies depending on the composition of the active material layer.
  • the step of (b) laminating an active material layer may be implemented by coating the active material on the active material-laminated portion and a part or all of the upper portion of the masking tape.
  • the step of laminating an active material layer may further include, after coating the active material, pressing the coated active material layer.
  • the active material coating and pressing steps may be implemented using methods known in the art.
  • the cutting groove in the step (c) is, as illustrated in FIG. 4 , preferably formed on a side of the active material layer positioned on the masking tape around the boundary of the masking tape and active material layer.
  • the cutting groove being formed on the above-mentioned position may be advantageous for securing battery capacity because, as illustrated in FIG. 6 , the cross-section of the remaining active material layer may be formed close to a right angle after removing the masking tape.
  • attaching the masking tape in the steps (a) to (d) may be, as illustrated in FIG. 7 and FIG. 8 , implemented by a roll-to-roll process.
  • the masking tape may include a film substrate and a pressure-sensitive adhesive layer (PSA), and a release film may be further attached to the pressure-sensitive adhesive layer.
  • PSA pressure-sensitive adhesive layer
  • the release film may be removed in the step prior to adhering the masking tape to the current collector.
  • the active material layer may be laminated on, by a common roll-to-roll process, the current collector to which the masking tape is not attached, or the portion to which the masking tape is attached and the current collector to which the masking tape is not attached.
  • the roll-to-roll process may be implemented using methods known in the art.
  • the present invention relates to an electrode prepared using the preparation method disclosed herein, including
  • the corner portion where an upper surface of the active material layer and a side wall surface forming a thickness of the active material layer meet includes a partial form of the cutting groove, thereby being formed in a right-angled shape.
  • the right-angled shape includes a substantially right-angled shape as well as a right angle following strict criteria.
  • the side wall surface forming a thickness of the active material layer may be a side wall surface in a direction where an electrode tap is formed.
  • the electrode may be formed using the method for preparing an electrode in the present disclosure.
  • the current collector is a positive electrode current collector or a negative electrode current collector, and current collectors known in the art may be used without limitation.
  • foil prepared with copper, aluminum, gold, nickel, a copper alloy, or a combination thereof may be used as the current collector.
  • the active material layer may be a positive electrode active material layer or a negative electrode active material layer.
  • the active material layer may be formed as active material slurry including a positive electrode active material or a negative electrode active material and a binder, and the active material slurry may further include a conductive material, and as necessary, may also further include a dispersant.
  • the positive electrode active material As the positive electrode active material, the negative electrode active material, the binder and the conductive material, components known in the art may be used without limitation.
  • the positive electrode active material may be, for example, lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron oxide, LiNi x Mn y Co z O 2 (NMC) that is a three-component positive electrode material, lithium composite oxides obtained by combining these, or the like.
  • NMC LiNi x Mn y Co z O 2
  • a sulfur-carbon composite may be included as the positive electrode active material.
  • the negative electrode active material may be, for example, LiTi 2 (PO 4 ) 3 , Li 3 V 2 (PO 4 ) 3 , LiVP 2 O 7 , LiFeP 2 O 7 , LiVPO 4 F, LiVPO 4 O, LiFeSO 4 F and the like.
  • the negative electrode active material may have a carbon coating layer formed on the surface.
  • the conductor may be, for example, carbon black such as Super-P, denka black, acetylene black, ketjen black, channel black, furnace black, lamp black, to thermal black; carbon derivatives such as carbon nanotubes or fullerene; conductive fibers such as carbon fibers or metal fibers; fluorocarbon, aluminum, metal powders such as nickel powder; or conductive polymers such as polyaniline, polythiophene, polyacetylene or polypyrrole, and the like.
  • carbon black such as Super-P, denka black, acetylene black, ketjen black, channel black, furnace black, lamp black, to thermal black
  • carbon derivatives such as carbon nanotubes or fullerene
  • conductive fibers such as carbon fibers or metal fibers
  • fluorocarbon aluminum, metal powders such as nickel powder
  • conductive polymers such as polyaniline, polythiophene, polyacetylene or polypyrrole, and the like.
  • the electrode may be a positive electrode or a negative electrode, and a method for preparing the same is not particularly limited, and the electrode may be prepared in a form in which a positive electrode active material layer or a negative electrode active material layer is bound to a current collector according to methods commonly known in the art.
  • the electrode may be used in a secondary battery, and for example, may be used in a lithium ion secondary battery.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Connection Of Batteries Or Terminals (AREA)
EP22838018.4A 2021-07-08 2022-07-07 Electrode and manufacturing method therefor Pending EP4333090A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020210089425A KR20230008975A (ko) 2021-07-08 2021-07-08 전극 및 이의 제조 방법
PCT/KR2022/009862 WO2023282666A1 (ko) 2021-07-08 2022-07-07 전극 및 이의 제조 방법

Publications (1)

Publication Number Publication Date
EP4333090A1 true EP4333090A1 (en) 2024-03-06

Family

ID=84801961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22838018.4A Pending EP4333090A1 (en) 2021-07-08 2022-07-07 Electrode and manufacturing method therefor

Country Status (5)

Country Link
EP (1) EP4333090A1 (zh)
JP (1) JP2024520732A (zh)
KR (1) KR20230008975A (zh)
CN (1) CN117480627A (zh)
WO (1) WO2023282666A1 (zh)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4233670B2 (ja) 1999-03-01 2009-03-04 パナソニック株式会社 非水電解液二次電池の製造方法
JP4594590B2 (ja) * 2002-12-27 2010-12-08 パナソニック株式会社 電気化学素子
JP6919572B2 (ja) * 2015-12-22 2021-08-18 日本電気株式会社 二次電池とその製造方法
CN208173722U (zh) * 2017-08-24 2018-11-30 日立汽车系统株式会社 二次电池
JP7253147B2 (ja) * 2019-11-26 2023-04-06 トヨタ自動車株式会社 非水電解質二次電池
KR20210089425A (ko) 2020-01-08 2021-07-16 주식회사 에듀에스알티 모바일 영어단어 학습장치 및 그의 동작방법

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Publication number Publication date
KR20230008975A (ko) 2023-01-17
JP2024520732A (ja) 2024-05-24
CN117480627A (zh) 2024-01-30
WO2023282666A1 (ko) 2023-01-12

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